Office for Nuclear Regulation

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Sizewell A - Level 1 Demonstration of Emergency Plan

Executive summary

Purpose of Intervention

The purpose of this inspection was to seek assurance that the licensee’s emergency arrangements and its emergency response personnel have the capability to deal effectively with emergencies with on-site consequences.

Interventions Carried Out by ONR

The site’s compliance with Licence Condition 11 (Emergency Arrangements) was inspected which involved an ONR inspector observing a demonstration emergency exercise held out-of-hours on the evening of 6 November 2019.

Explanation of Judgement if Safety System Not Judged to be Adequate

Not Applicable.

Key Findings, Inspector's Opinions and Reasons for Judgements Made

Sizewell A site ceased power generation in 2006 and the de-fuelling of the reactors was completed in 2014, thereby removing most of the nuclear hazard from the site. Magnox Limited is now in the process of decommissioning the site. 

Magnox Limited have carried out the assessment required under the revised Radiation (Emergency Preparedness and Public Information) Regulations (REPPIR) 2019 and determined that an off-site radiation emergency as defined in the regulations is not possible, and as such REPPIR 2019 does not apply to the work undertaken at Sizewell A.

Prior to the exercise ONR’s inspector examined the exercise scenario, judging that it represented a sufficient challenge to the demonstration team and was proportionate to the hazard left on the site i.e. de-fuelled and with no reasonably foreseeable radiation emergency (as defined by REPPIR).

ONR’s inspector deemed that the licensee’s response provided an adequate demonstration of its emergency arrangements and, based upon their observation of the exercise, judged that the licensee’s emergency response personnel have the capability to deal effectively with emergencies with on-site consequences.

Conclusion of Intervention

It was the ONR Inspector’s judgment that the licensee has made and implemented adequate arrangements for dealing with any accident or emergency on the site.